linux-kernel - Re: [PATCH V4] tick/hotplug: Handover time related duties before cpu offline

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Message-ID: <1424148916.31713.1.camel@ellerman.id.au>
Date:	Tue, 17 Feb 2015 15:55:16 +1100
From:	Michael Ellerman <mpe@...erman.id.au>
To:	Preeti U Murthy <preeti@...ux.vnet.ibm.com>
Cc:	aik@...abs.ru, shreyas@...ux.vnet.ibm.com,
	linux-kernel@...r.kernel.org, anton@...ba.org, tglx@...utronix.de,
	linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH V4] tick/hotplug: Handover time related duties before
 cpu offline

On Tue, 2015-02-17 at 09:38 +0530, Preeti U Murthy wrote:
> On 02/17/2015 07:28 AM, Michael Ellerman wrote:
> > On Sat, 2015-01-31 at 09:44 +0530, Preeti U Murthy wrote:
> >> These duties include do_timer to update jiffies and broadcast wakeups on those
> >> platforms which do not have an external device to handle wakeup of cpus from deep
> >> idle states. The handover of these duties is not robust against a cpu offline
> >> operation today.
> > 
> > Hi Preeti,
> > 
> > This bug is still causing breakage for people on Power8 machines.
> > 
> > Are we just waiting for Thomas to take the patch?
> 
> Hi mpe,
> 
> Thomas has included the patch for fixing this issue in a recent patchset
> that he posted for cleaning up tick/clockevents related code.

> https://lkml.org/lkml/2015/2/16/213. I think it will go into this
> merge-window. There are a couple of issues there, once that is fixed I
> will remind him to mark it for stable.

Ah thanks. I missed it when searching LKML because it was posted by Peter.

cheers


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